Explosion-type pulier



Oct. 5, 1943.r w. A. BRECHT r-:T AL 2,331,167

EXPLOSION-TYPE FULLER Filed May 25, 1942 ATTORNEY Patented Oct. 5, 1943 UNITED STATES PATENT OFFICE i nxrnosrarmm l Winton A. Bred, Forest Hills, lllll mld F.

vania Hanson.' Wilkinsburg. Pa., asslgnors to Westingliouse Electric ai Manufacturing Company,

East Pittsburg Pa., a corporation of Application May z3. 1942, sel-m No. 444,218

s claims. (ci. :es-a) This invention relates to disassembling apparatus, and more particularly to apparatus for removing pinions, bearings, or other machine elements rigidly mounted, by a press or shrink nt, on a shaft.

Electric railway motor pinions get considerably greater wear than the other gear units in a gear transmission disposed between an electric motor and locomotive or street car wheel. This means that it is part of the regular maintenance work to remove worn pinions from the motor shaft. A similar, situation also arises in many other applications.

v One obfect membersv interconnected by a press orI shrink fit without subjecting any of the members to sharp mechanical impacts.

Another object of our invention is the provision of means for disassembling members connected by a press or shrink fIt by the use of huid pressure without the use of complicated and expensive hydraulic equipment.

'lhe objects recited are merely illustrative. Other objects and advantages will become readily apparent from a study of the following specification and the accompanying drawing, in which:

Figure 1 shows a longitudinal sectional view of our contribution to the art; and

` Fig. 2 shows a detail in section of a modihed construction.

Our invention, or pinion puller, as it may be designated, is of particular utility for removing .pinions from the ends of railway motor shafts.

These pinions are nearly always applied to their shafts, having a tapered end, .by a heavy shrink or press fit. Regardless of whether shrunk fit or press iit on the shaft,` the removal of these pinions is usually quite a task.

Larger shops usually have hydraulic presses available but many parts cannot be handled on such presse. Furthermore, such presses are not well adapted for removing pinions or other machine elements when all other parts are in position.

We provide a rugged portable device that can be applied where needed and which has all the advantages of a hydraulic press. A

In Fig. l, I designates a railway motor shaft upon the tapered end 2 of which the pinion 3 is rigidly mounted. The end of the shaft is usually provided with the stub end t having the threads 5 normally provided for some other purpose than the removal of the pinion. The pinion 3 is also provided with threads at 6, also normally prorvided for the removal of the pinion.

of our invention is to disassemble I Our rugged pinion puller comprises a piston 1 threaded at l to be positioned on the stub end 4 of shaft I. This piston 1 is screwed down tightly against the end of the shaft end at 0 to form a .rigid structure with the shaft. Before positioning the piston on the shaft a softcopper ring I0 is placed between the piston head II and the pinion.

'I'he piston head I I is designed to ht snugly into the cylinder Il. 'I'he piston head may be provided with soft copper piston rings I3 as shown in Fig. 2. These ringsprevent leakage of gases from chamber Il.

The cylinder I3 is provided with threads I5 at its left-hand extension, and when the puller is to be used the cylinder is screwed tightly against the pinion I at -region I6. The cylinder and pinion thus form a rigid structure. When assembled, the parts are 'in the position as shown.

'I he cylinder is provided with a barrel portion Il having its muzzle end opening into chamber It. The barrel portion may be oi' just suiiicient length to receive a blank shotgun shell I8 orv similar shell, as shown. After a shell, as I8, is in position, the breech block I9 having the firing l pin Il is screwed in position, as shown.

' pinions.

To remove the pinion 3, the attendant then A merely mp8 the head 2l of the llng pin 20 with a hammer to set on the charge 23 in the shell. As theV charge in the shell explodes, a tremendous fluid pressurev is set up in chamber It and relative movement is set up between the cylinder I3 and the pinion 3 rigidly attached thereto and the piston l rigidly attached to shaft I.

The pinion 3 is thus removed from the tapered portion 2 of the shaft I. As the piston l moves to the left with reference to cylinder I3, it uncovers the exhaust ports 24 to dissipate the pressure in chamber It. By thus relieving the presf sure in chamber Il as soon as the pinion is loose on the shaft the "follow through effect of the explosion is prevented. Further, the soft copper ring Il takes up the shock, avoids excessive noise, and above all prevents the cylinder I3 and pinion 3 from being thrown toward the right like a projectile or bullet. It is thus apparent that our simple rugged structure provides means for rapidly and safelyV removing a pinion from a shaft and yet.'after exploding a. charge, the parts are all generally in the same relative position shown except that the exhaust ports are uncovered and the pinion is no longer stuck on the shaft.

Our device isnot limited to the removal of Clearly, roller bearing races, or other to the machine element and having a snug sliding tit over the piston head and designed to form a cylinder head chamber over the piston head, and means for detonatlng an explosive charge in the cylinder head chamber.

2. In a device for removing a machine element from the tapered end of a shaft upon which it is rigidly mounted by a pressure fit, in combina-l tion, a piston, having a. head, rigidly secured to the end ci the shaft, a loosely mounted cushioning ring disposed, between the piston head and the machine element, a cylinder rigidly secured der having its muzzle end opening into the cylinder-w head chamber, said barrel being designed to receive a conventional gun shell at itsV breech end, a shell in the barrel, a charge of explosive in the shell, and means ior detonating the charge ci explosive.

4. In a device for removing a machine element from the tapered end of a shaft upon which it is rigidly mounted by a pressure nt, in combination, a piston, having a head, rigidly secured to the end or the shaft, a loosely mounted cushioning ring disposed between the piston head and to the machine element and having a snug sliding ilt over the piston head and designed to form a cylinder headl chamber over the pistonv head, a barrel connected to the cylinder, said barrel being designed to receive a conventional gun shell at its breech end and having its muzzle end opening into the cylinder head chamber, a shell in the barrel, an explosive charge in the shell, a breeck block for retaining the shell in position, and means for detonating the charge oi' explosive.

3. In a device for removing a machine element'from the tapered end of a shaft upon which it is rigidly mounted by a pressure iit, in combination, a piston, having a head, rigidly secured to the end of the shaft; a loosely mounted cushioning ring disposed between the piston head and the machine element, a cylinder rigidly secured to the machine element and having a snug sliding fit over the piston head and designed to form a cylinder head chamber over the piston head, a barrel integral with the cylinthe machine element, a cylinder rigidly secured to the machine element and having a snug sliding fit over the piston head and designed to form a cylinder head chamber over the piston head, a barrel portion in the cylinder having its muzzle end opening into thepylinder head chamber, said barrel portionhaving such dimensions as to receive a conventional shotgun or similar shell, a shell containing a charge of explosive disposed in the barrel, and means for detonating the charge of explosive. 5. In a device for removing a machine element from the tapered end of a shaft upon which it is rigidly mounted by a pressure i'lt, in .combination, a piston, having a head, rigidly secured to the end of the shaft, a loosely mounted cushioniing ring disposed between the piston head `and the machine element, a cylinder rigidly secured` to the machine element and having a snug sliding nt over the piston head and designed to form a cylinder head chamber over the piston head, a barrel integral with the cylinder having its muzzle end opening into the cylinder head chamber, said barrel being designed to receive a conventional gun shell at its breech end, a shell in the barrel, an explosive charge in th'e shell. a breech block for retaining the shell in the barrel, and a firing pin in the breech block for detonating the explosive charge.

WINSTON A. BRECHT.

HAROLD F. HANSON. 

